Snakes on a plane is a ridiculous movie concept, but the release of the movie has certainly helped us all to pay a bit more attention to real-life snakes on a plane scenarios. A Qantas flight from Australia to Japan was delayed for a full day recently when a Mandarin rat snake was discovered on board. Mandarin rat snakes are nonvenomous and small — adults don’t usually grow any longer than seven inches, though this particular snake was eight inches long. The snake was removed and eventually euthanized.